An oxyhydrogen generator comprises an electrolyser consisting of a plurality of electrolytic cells ( 1 ) covered by a hermetically sealed housing. Each cell ( 1 ) comprises a chamber (2), forming an electrolytic bath where a plurality of alternating anodes (4.2) and cathodes (4.1 ) are housed, a metal screen (5) being mounted between the electrodes (4). Electrodes (4) are connected in series to a DC source, and the electrolytic baths of chambers (2) are interconnected via spillways (6). In the upper end of the housing, an inlet (7) is formed for charging cells (1) with electrolyte, connected to reservoir (8) for electrolyte and at least one outlet (12.1 ) for the discharge of the resultant oxyhydrogen gas from cells (1 ). The oxyhydrogen generator has a microprocessor module (9) for the control and management of the parameters of the electrolysing process.